Depends a lot on what your experience is and what the job you're applying for is.
I'm in a skilled technical profession. I don't need to care much about my CV, because the kind of positions I apply for, they're going to scan my CV for 5 seconds, see that I've got a load of relevant experience and then get me in for interview. Just the job titles and time in post are enough, don't need any details.
If you're changing industries or roles, are in relatively unskilled work or roles with thousands of people applying...well yeah you've got to take the time to make the most of every position you've worked in, highlight what you've done that is relevant to the position you're going for. Format it nicely, anything to just stick in the sifter's mind that little bit longer than the hundreds of other CVs.